05 September 2017

Solar Panels on the Boat - And they're GREAT!

Maggie May - just before the solar panels arrive. They'll go on the upper roof.

Look at the setup - doesn't it look totally streamlined?
Like the system came with the boat originally?

We thought we'd be drilling all sorts of holes through the roof. 
- Cables all over the interior.
But no - it looks GREAT.

The mounting corners are glued with a silicon glue. No holes.

This is the first time either Stan or I have had a solar energy system. 
We've both been interested in it over the years - since the late 60's, really. 

For one reason or another, it was never practical.
But now we're thinking:
It really works well - everyone should use solar energy!

Ok, everyone on a boat, at least.
Boats already have the battery bank, right?

The bank of batteries - in the required battery box.

It took us a long time to figure out what we needed. 
How it would work. 
We were starting from scratch.
I wanted to understand it thoroughly.

All these diagrams and watts and amps and volts.
12v vs. 220v. Direct and alternating current.

The wiring behind the helm. 

One of the technicians - the agent from Viktron - said it succinctly:
"A solar power system is a balance - between production - storage - and - usage."

That's it in a nutshell. 

We had to figure out what our requirements are.
We had no idea, really.

- How many amp hours does the fridge use? 
- What's the wattage on a laptop? 
- Are ALL the cabin lights LED?

Trish in the galley, while the guys inspect the engine room.

Then - how to run the cables invisibly - from the roof of the boat - to the battery bank in the engine room? Since the carpentry on the boat is particularly tight, and has no visible nails or screws - this wasn't easy.

Stan and the Viktron guy try to find a way through the A/C unit. Not possible.

Here's the technical details of our system:

4 solar panels of 150 W each.
They fit nicely on the roof, with enough space for us to walk between them.

A 100w/50 amp MPPT controller - the brains of the system.

MPPT controller - next to the (older) battery charger.

2 monitors - one for the battery, one for the solar panels

We already have 3 12-volt house batteries of 125 amp hours each on the boat.

- Plus one for the engine. 
- And another one for the generator.

The solar panels just charge the house batteries. 

These new solar panels are really efficient.
They don't have to be angled to follow the sun's path. 
They work even when it's pretty shady, or when part of the panels are covered.

2 small holes for the cables.

And on the first day, we were TOTALLY charged up - by 9 am.

So now - we can charge the computers, phones - and run the fridge (we've been turning it off every night-) and the batteries are charged higher than we've been able to get them all summer.

- Without running the generator or the engine.
- Or having to plug in to shore power.

So - the system is working better than we expected.
(If you live in a house, connected to 220v, this may not seem like such a big deal.
On a boat, it really IS a big deal!)

You know...the boat also has a second fridge. 
We haven't turned it on yet.
Up until now, one small fridge has totally depleted our batteries every night. 

Night time on the canal - time to turn the fridge off.

But now - who knows?
A little luxury?

We may use the second fridge - just for chilling the wine.


  1. I have been either plugging into shore power(220v)(80 meters away)(3 long extension cords)(cost @ 2 hrs. 8 EU) or running the generator (38hp 3 cylinder diesel/ 3.8 Liters per hr.)(approx. cost for 2 hours 7+ EU) Every morning since we have been here. This not only charges up the house batteries but also gives us AC to charge up our phones, laptops, internet box, etc...Since our solar install I have not done any of this! Our house batteries are maintained at 12.7-13.2v (100%) we can use our DC to AC inverter to charge laptops. phones, kindles, etc... Wow! Now I could just start drinking wine during my morning music practice instead of thinking about energy requirements. (But I haven't gone that native yet!)

  2. Replies
    1. Not really. You don't want to step on them, but otherwise they're pretty durable.

  3. A decent case of the energy productivity that these solar panels can offer would be that a solar panel utilizing a sum of 36 monocrystalline cells can by and large create around 100 to 130 watts. electricians in cherry hill nj