Sizing My MPPT and DC-DC charger to Match My LifePO4 Battery

[jrmartin505]

So I picked a 150Ah LifePO4 battery which apparently likes to be charged at 14.6V and 20 Amps. Did I pick the right parts to charge?

Victron Energy Orion-Tr Smart 12/12-Volt 18 amp 220-Watt DC-DC Battery Charger, Insulated

SmartSolar MPPT 75V 15 amp 12/24-Volt Solar Charge Controller

At first I thought they seemed matched, but now I’m wondering if they are underpowered? For example I want to be able to run my engine for an hour or so and charge my batteries as I’ve heard other boaters say they do. However if my math is right I’ll have to run my engine all day with this DC-DC charger. At 220 watts, my battery which holds 2048 watt hours will take 2048/220= 9.3 hours to charge.

Same story with the MPPT. I have a 180 Watt 36V solar panel, and wonder if this MPPT takes full advantage of it.

If these are wrong please recommend better Victron parts.
Thanks in advance

[pwfarnell]

You need to look at the details of your battery, often they quote a really conservative charge value and a max charge value of something like 75A in your case.

I would use an Orion XS for engine charging, that can do 50A so would be much faster, 2 hours to get 70% charge into the battery.

The solar controller will do around 210W so is well matched to your panel.

[jrmartin505]

OK, thanks for the quick response. I’ll keep the MPPT, and upgrade the DC-DC charger.