This year we tested our new 175 Watt SunPower cell solar panel with our integrated water heating system on a 6 week cruise in Northern Lake Huron at a latitude of about 46 degrees.  We used an EP Xtra-N 20 amp MPPT Controller.  The 175 watt panel provided plenty of power to meet our 70 amp hour per day requirements.  The 175 watt panel was mounted using our CMP pole mounting system so I could tilt and rotate the panel to achieve optimum sun angle.  I set the sun angle once and rotated the panel three times a day (morning, midday, evening) and estimate I got about 30% more performance over a fixed horizontally mounted panel.

Operating statistics:

Our power usage averaged approximately 70 amp hours or 850 watt hours in a 24 hour period.  Our current draw was from a refrigerator/freezer running 24/7, our LED lights in the evening, cell phone chargers, laptop computer several hours a day and our radios and instruments during the day.  Our windlass is only run when the engine is running so we don't include it in our power consumption calculation as the alternator quickly makes up for its power usage.  We have a 75 amp Balmar alternator with a smart regulator.  We changed our battery system this year by installing two 100 amp hour CMP LiFePo4 batteries for our house bank and one for our starting battery.  I will post more about these batteries and our exciting findings soon.  We started the engine to move anchorages about every three days.

Results and findings:

1. Our battery bank was fully charged by 1 PM most sunny or mostly sunny days when at anchor.  This is about the same charging time that we experienced last year with the 160 watt solar panel.
2. The EP Xtra-N MPPT controller with the remote display proved to be an outstanding piece of equipment.  It was simple to program, easy to read, collected the appropriate data and was very efficient.  It was exciting (I get excited about these things) to see 6 to 10 amps being poured into the battery bank in the morning.  It would be frustrating to see it only outputting and amp or two in the afternoon in full sun but then you realize it is doing its job.  It fully charged the batteries in the morning and was in float mode topping off the battery bank in the afternoon.
3. Because we have excess power in the afternoon on sunny days, we installed an inverter and purchased an ice maker.  This turned out to be worthwhile purchase.  Ice for drinks was a free luxury (power wise) that we really enjoyed.
4. Rotating the panel during the day, especially in the morning, significantly increased the power generation of the panel.
5. The data gathered confirmed that this panel configuration supplied all the power we needed and had excess capacity to catch up on battery charge after a string of cloudy days.
6. The panel was affected by shading as would be expected.  Occasionally the panel was shaded by the back stay or the mast.  While the shading was minimal, it degraded the performance by up to 40%.
7. We installed a new larger heat exchanger on the back of the panel for our water heating system  This worked well on those sunny days so we had warm water for showers and dish washing.  Power consumption of this system was minimal.

Data:

 175 Watt Solar Panel                    At anchor   Motor         Sunny to         Cloudy to
                                                                                        Mostly Sunny  Mostly Cloudy

Average watt hrs per day                    750        480              900                  435
Average amp hours per day                     58          37                69                   33
​Maximum watt output in 24 hours   1,280        750           1,280                 570
Maximum amp hours in 24 hours            98          58                 98                   44
​

​
160 Watt Solar Panel                    At anchor   Motor         Sunny to         Cloudy to
                                                                                        Mostly Sunny  Mostly Cloudy

Average watt hrs per day                    660         480             700                 400
Average amp hours per day                     51          37               54                   31
​Maximum watt output in 24 hours   1,210        770           1,210                 770
Maximum amp hours in 24 hours             93          59                93                  59
​
Observations:
1. The minimum watt hour output doesn't mean much because it is dependent on both the cloud cover and the state of charge of the bank as a result of alternator charging,
2. The maximum watt hours per day of 1,280 is not the maximum output capacity of the system in a 24 hour period because the batteries were charged by 1 PM so the controller shut down the charge from the panel.  A higher drain on the house battery bank would have resulted in this number being higher.
3. Average amp hours per day is computed by dividing the watt hours by 13 volts.  This is a ballpark calculation.
4. This configuration proved to have plenty of capacity for our cruising needs even without using an auxiliary flexible solar panel we store under a bunk.  We did not use shore power to charge our battery bank for the entire summer.

Solar Water Heater:

We installed our new solar water heating system.  It consists of a heat collector or heat exchanger mounted on the back of the solar panel, and a circulating pump.  See our earlier blog for design considerations.  The pump circulates water from the water heater through the heat exchanger on the panel.  We used the same configuration on our 120 watt panel last year.

Results:

On sunny days at anchor we had warm water for showers and dish washing.  The water temperature in our 6 gallon hot water tank would warm from 60 degrees to about 105 degrees in 2-3 hours on a sunny calm day.  As expected, we confirmed that strong winds tend to cool the panel and reduce the heating efficiency as do clouds.  Overall, the water heating system cools the surface of the panel by at least 20 degrees.  This increases the efficiency of the panel since solar panel performance degrades as they are heated by the sun. Insulating the tubing running between the heat exchanger and the water heater significantly increased the efficiency of the system.  In conclusion, the radiant energy water heating system works well on sunny days with both our larger and our standard sized panels. See our product section or read our earlier blog for details.

Custom Marine Products will be conducting three seminars at the Pacific Sail and & Power Boat Show in Richmond, CA April 20, 21 and 22.  These seminars will provide an introduction to the basics of PV marine solar panel technology and how to apply this technology to design a solar system for your cruising needs.  The seminars will also include a mini workshop in determining your electrical energy usage as a first step in designing a custom marine solar system.  I have presented many of these seminars at various boat shows and they have been well received.  No sign up is required.  Just attend and enjoy. 

The seminar material can be found on our website under SUPPORT, MANUALS & INFO, last item.
​

Our 120 watt rigid marine solar panel with premium SunPower cells has been so popular we have expanded our product offering to include 100 and 160 watt rigid marine solar panels with premium SunPower cells.  These high performers are well suited for top-of-pole mounting or frame mounting on a bimini or on dinghy davits.  This line of marine solar panels is made to our specification and offer the highest output per square inch in the industry.

I have installed our radiant water heating heat exchanger to the back of a 160 watt SunPower panel and will be testing and reporting on performance after our cruise in the North Channel of Lake Huron later this summer.  This promises to be our best top-of-pole system yet.  See my earlier blog reporting on the 120 watt SunPower cell panel from last year's cruise.

I recently ran across this article from the Department of Energy about solar panel performance.  It identifies the three key factors related to panel performance; heat, dirt and shading.
​Link to article:   Getting the Most Out of Solar Panels

This year we tested our new 120 Watt SunPower cell solar panel with our integrated water heating system on a 5 week cruise in Northern Lake Huron at a latitude of about 46 degrees.  We used an EP 20 amp MPPT Controller.  A 10 amp controller would have been sufficient but we wanted extra capacity so we could plug in an auxiliary 100 watt semi-flexible panel as a backup if we needed additional power because of a series of cloudy days. Plugging in an extra panel is simple using the MC4 connectors and an MC4 T-branch connector. We had mostly sunny days so we didn't need additional power beyond what the 120 watt panel provided.  The weather was awesome!  The 120 watt panel was mounted using our CMP pole mounting system so I could tilt and rotate the panel to achieve optimum sun angle.  I set the sun angle once and rotated the panel three times a day (morning, midday, evening) and figure I got about 30% more performance over a fixed horizontally mounted panel.

Operating statistics:

Our power usage averaged approximately 70 amp hours or 850 watt hours in a 24 hour period.  Our current draw was from a refrigerator/freezer running 24/7, our LED lights in the evening, cell phone chargers, laptop computer several hours a day and our radios and instruments during the day.  Our windlass is only run when the engine is running so we don't include it in our power consumption calculation as the alternator quickly makes up for its power usage.  We have a 75 amp Balmar alternator with a smart regulator.  Our house bank consists of 3 flooded cell batteries giving us a total capacity of 330 amp hours.  We started the engine to move anchorages about every three days.

Results and findings:

1. Our battery bank was fully charged by 2 PM most sunny or mostly sunny days when at anchor.  This is in contrast to 12-1 PM in past years using our 150 or 160 watt panels on poles.
2. The EP Tracer BN MPPT controller with the remote display proved to be an outstanding piece of equipment.  It was simple to program, easy to read, collected the appropriate data and was very efficient.  It was exciting (I get excited about these things) to see 8+ amps being poured into the battery bank in the morning.  It would be frustrating to see it only outputting and amp or two in the afternoon in full sun but then you realize it is doing its job.  It fully charged the batteries in the morning and was in float mode topping off the battery bank in the afternoon.
3. Rotating the panel during the day, especially in the morning, significantly increased the power generation of the panel.
4. Our weather was so sunny and the panel performed so well we had no reason to plug in the auxiliary 100 watt flexible panel using an MC4 T-branch for extra charging power.  I plugged it in one morning just to confirm the configuration would work and was easy to do.  It worked well and brought the charging amps to well over 12 amps.
5. The data gathered confirmed that this panel configuration supplied all the power we needed and has excess capacity to catch up on battery charge from a string of cloudy days.
6. The panel was affected by shading as would be expected.  Occasionally the panel was shaded by the back stay or the mast.  While the shading was minimal, it degraded the performance by up to 40%.

Data:
                                                  At anchor   Motor         Sunny to         Cloudy to
                                                                                 Mostly Sunny  Mostly Cloudy

Average watt hrs per day                  740        540             650                 290
Average amp hours per day                 57          45               50                   22
​Maximum watt output in 24 hours    960        630             960                 540
Minimum watt output in 24 hours        200         200             420                 170

Observations:
1. The minimum watt hour output doesn't mean much because it is dependent on both the cloud cover and the state of charge of the bank as a result of alternator charging,
2. The maximum watt hours per day of 960 is not the maximum output capacity of the system in a 24 hour period because the batteries were charged by 2 PM so the controller shut down the charge from the panel.  A higher drain on the house battery bank would have resulted in this number being higher.
3. Average amp hours per day is computed by dividing the watt hours by 13 volts.  This is a ballpark calculation.
4. This configuration proved to have plenty of capacity for our cruising needs even without using the auxiliary solar panel.  We have not used shore power to charge our battery bank for the entire summer.

Solar Water Heater:

We installed our new solar water heating system.  It consists of a heat collector or heat exchanger mounted on the back of the solar panel, and a circulating pump.  See our earlier blog for design considerations.  The pump circulates water from the water heater through the heat exchanger on the panel.  We used the same configuration on our 150 watt panel last year.

Results:

On sunny days at anchor we had warm water for showers and dish washing.  The water temperature in our 8 gallon hot water tank would warm from 60 degrees to about 105 degrees in 2-3 hours on a sunny calm day.  This was slower than the system we tested last year on our larger panel but it was perfectly adequate to meet our needs.  As expected, we confirmed that strong winds tend to cool the panel and reduce the heating efficiency as do clouds.  Overall, the water heating system cools the surface of the panel by at least 20 degrees.  This increases the efficiency of the panel since solar panel performance degrades as they are heated by the sun. Insulating the tubing running between the heat exchanger and the water heater significantly increased the efficiency of the system.  In conclusion, the radiant energy water heating system works well on sunny days with both our larger and our standard sized panels. See our product section or read our earlier blog for details.

We have been testing our 150 and 160 watt solar panels for the past few years on extended cruises.  While at anchor, on a sunny day, our battery banks are usually topped off by about 1 PM.  We run our refrigerator/freezer 24/7. So why not use a smaller 100 or 120 watt  solar panel and plug in a flexible panel on the rare occasion we need more charging power?  This is what we will be testing while cruising this summer.  It's a simple arrangement.  We will carry a 100 watt flexible solar panel under a bunk cushion.  If we need extra charging power we will simply plug it in using a T-branch connector at our pole mounted 120 watt panel and secure the flexible panel to the bimini top.  That gives us 220 watts of power through our 20 amp MPPT controller.  Several of our customers have reported using this configuration and are very satisfied with it.  I'll report our results at the end of the season.  Now, gotta go sailing and start testing.

We have all heard about tax credits for putting solar on our home but what about for our boat?  Sure, why not?
The US Federal Government offers a solar energy tax credit, applicable to your second home.  If you have a head and galley onboard and your boat is docked in the United States, your boat qualifies as a second home. This tax credit,extended to December 31, 2019, is a 30% credit on qualified expenditures to purchase and install solar panels placed in service after 2008. This credit can be retroactive – as long as the solar system was placed into service after January 1, 2006.
​
The Department of Energy website gives a simplified description of the energy tax credit: http://energy.gov/savings/residential-renewable-energy-tax-credit. The actual IRS form is easy to fill out: http://www.irs.gov/pub/irs-pdf/f5695.pdf. It may also worth investigating your state government solar tax credit.