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I don’t understand where your coming up with 22 to 33.3 Amps (OK I think I do, but I also think you are doing it wrong). It’s all about the Watts. Watts is power, Watt/hrs are storage (simplified

Yes, two strings of 4 panels is the way to go. Each to its own controller. I'm also using a MPPT controller to charge my 12V system from the 48V bank. In my case a 100/15 as I had it on hand. It

I have 8 x 100 watt flex panels charging my 48 volt battery bank with 2 x Victron 100/20 48 volt MPPT solar controllers. I think you will be much better off with 4 panels in series to each controller

Thanks for the response. You noted that I had two strings of four panels, which I do, but they would be pairs in series & parallel with each :-|____|+........ -|___|+: other :-|____|+........ -|___|+:

" Both Genasun and Renogy make MPPT controllers that step up for 48V batteries.? Genasun being much the preferred brand." Thanks Paul, very good info there. I had never heard of Genasun. Those

I have no skin in this game at the moment, but I sure appreciate this type of explanation.

" I don’t know of any SOLAR battery charger/converters that will step up AND down. They might be out there somewhere, but I don’t know of any, I have only ever seen solar step-down

“…..or am I way off? 100watts/12volts =8.33 amps x 4 =33.3 .......100watts/18volts= 5.5amps x 4= 22.2amps……” You are way off. You “add voltage in series” and “add amps in parallel”.

I'm using Victron MPT 150/35 charge controllers on each of my 3 panels that are in series and it has no issue evening out the voltage.? It has a rotary switch that lets you set the charge profile

Yes, I've been thinking about that, in that the panels are rated at 12 volts but on a sunny day, they roll out an average of 18 volts. That's the dilemma. With each panel putting out 18 volts, I'll

“?I have 8 100watt/12 volt panels ……” I have seen some 100 Watt panels advertised as 12V, but most actually put out somewhere between 21 and 26 “open Volts” (just measured with a meter

“Do solar panel charge controllers work well with lithium batterys?” Here is the age old “it depends” answer…… *IF* , your controller is *capable* of being set up for your

NP Dale good luck with the set up.? I'd recommend trying different locations/angles and measuring the output voltage/current to see what works best. Other than the efficiency I find that using

I think it wise to always have a separate 12V system for your instruments, running lights, and communications along with at least one stone age lead acid (or AGM) battery to power it with. And know

Thanks Jeff. I have 8 100watt/12 volt panels and am considering parallel/series them to have 4 sets of two panels in parallel and then those four sets set together in series to give me 48 volts and up

I'm using 6 110 watt panels and 2 Victron charge controllers (3 panels wired in series on each) to charge my 3 48V Dakota Lithium batteries with no issues other than the amount of time required.? I

Do solar panel charge controllers work well with lithium batterys? [email protected]> wrote:

Most cruising boats in the US are wired with 120V AC for things like water heaters, air conditioners, refrigerators, and electrical outlets for all the stuff we bring from shore (blenders, table top

Thank you for your replies. I understand the relationship between battery motor and generator. Getting back to my question. Why would it be harmful to wire the boat with 120 ac? What disadvantages

Agree that lead acid is stone age…not sure if I agree about non-LiFePo lithium options---I’ve been powering my boat now for maybe 10 years with ex-THINK Enerdel lithium-ion batteries with