Thanks Noelex, I will endeavor to get the exact Panel specs when in a couple of days.....
Here is the full transcript of what the local dealer sent to me.....
There are a few ways to do this, though connecting all 3 panels together is not one of them.
It's not recommended to mix panel sizes or you restrict the larger ones to the specifications of the smallest one.
Assuming that the 2 batteries are a starter battery and house battery and it's on a boat my recommendation would be;
Connect the 80W panel to a Morningstar Sunguard 4A to the starter battery
Connect the 2 x 150W panels in parallel to a Morningstar Sunsaver 12V 20A to the house battery
Connect a Victron Cyrix-CT battery combiner between the starter and house battery so when the alternator
of the boat motor
charges the starter battery, the excess will flow into the house battery, additionally, when the starter battery is full, the charge from the Sunguard will also flow over into the house battery.
Given that the starter battery should always be full, you'll always be getting a charge to the house battery from all panels when in the sun, you'll also be getting a charge from the alternator
The Cyrix is an intelligent combiner so you won't overcharge the battery.
You only *need* an MPPT when charging a 12V battery bank from a 24V panel, or vise-versa, the 150W panels would have an open circuit voltage of about 22V with a short circuit current of about 8.5A, and would be rated at 12V. So a PWM controller with the panels in parallel would be fine as the PWM controller will drop the Voltage to a max of 15V and double the current to about 17A so that along with the 80W panel which will probably output around 4A, you'll get a good 20-24A charge to the batteries from solar alone.
MPPT's are said to be 30% more efficient, and the main difference is that where a PWM controller will drop the Voltage to 15V, the MPPT will convert the excess voltage to amps for a boost charge. The smallest and cheapest MPPT has a rated charge current of only 15A though, so there would be no benefit for your setup, they are only most effective for large systems over 1kw when applying 150V to a 70A charge rate from a 20A panel array in a 12/24/48V system.
The SunSaver can also take up to a 20A load, so you would connect your loads directly to it, it also has low voltage disconnect which will prevent the battery from discharging past 11.5V.
All of these components are rated for marine
use. The only downside is you won't have a digital LCD display of the battery voltage. As you know the Sunguard doesn't have any indicators and the Sunsaver has 3 LED lights
, Green for 100%, Orange for 50%, Red for < 10%.
I would suggest the Victron BMV-702 Battery monitor
for a display. Though not necessary, this will give you an accurate voltage read for both batteries.
You could apply the above solution without the Victron Cyrix, though you'll only charge the batteries independently and the house battery wont charge from the alternator.
2 x 150W panels in parallel to either a SunSaver Duo or BlueSolar Duo to each battery. This will only charge 1 battery at a time and will not charge the house battery from the alternator.
I wouldn't recommend connecting the 80W panel to either battery via a Sunguard or similar as the smaller regulators are not smart and could risk over charging when the Duo goes into a cycle.
I would like you thoughts on this. He seems to have quite a comprehensive store
My understanding is that If I switch my isolator Switch to 1+2 the Alternator Charges both battery banks??
This guy does seem to have quite a comprehensive store though..... here: