Increasing charging rate from mass combi

[WaldPinkler]

I have a mastervolt mass combi. It's capable of 60amp charging.

I have 270Ah of lithium and now a 1600W generator.

I want to increase the charging rate. I should be able to get 100A with the generator. What possibilities are there?

It's possible to parallel link 2 of the mass combi units but they are huge and very expensive.

There is a jumper setting for 2 parallel units, one master, one slave. I don't know what it does within the unit. Perhaps some synchronous buck but there's no schematic or information available.

Even a dumb power supply would be fine by me. I don't mind manually monitoring the charge rate with the generator going. I don't want to blow up the mass combi though. I assume a standard battery charger would have the same issue in parallel.

[more]

i now typing this in house whit tricky AC current charged with 100- uclear power station milion windmils, bilion solar panels . all this source must be synchronize work in HZ with timing with atomic watch.

you have only 2 source with simply DC current. buy another/couple ac/dc lifepo4 charger and plug in generator

[WaldPinkler]

There's issues with connecting power supplies or buck converters in parallel.

If there was nothing to consider then okay.

[goboatingnow]

Other then possibly needing a diode , ( which is almost always present in chargers ) there is no problem paralleling DC charge sources in general , my mppt, alternator and battery charger are just so paralleled.

Putting two DC chargers in parallel is fine. You can’t tell which one will finish the charge cycle but in bulk all chargers will be contributing

[sailjumanji]

Ok, incoming stupid question. You have a 1600-watt generator putting out AC amps to a MassCombi charger putting out DC amps into your lithium battery. Is your MassCombi a 60 amp model (because mine is 100 amp)? And if you add more charger capacity, are you going to be limited by the 1600-watt generator (i.e., not be able to achieve the 100 amps DC into the lithium battery).

I have a 100-amp MassCombi inverter/charger. I think we've seen 90 amps to LiFePo4 battery using the Honda 2200. But you know it tails off a bit as the battery gets full. Ours is a 360 Ah Mastervolt MLI.

Of course your other option is to replace the MassCombi with a 100 amp version. Sell your old working one. And not have to mess with diodes, etc.

[sailjumanji]

Originally Posted by goboatingnow

Putting two DC chargers in parallel is fine. You can’t tell which one will finish the charge cycle but in bulk all chargers will be contributing

Yep, when we are motoring, we have a DC-to-DC charger moving amps from the start battery to the Mastervolt LiFePo4 (MLI) battery, at the same time the Solar ChargeMaster is also sending amps to the MLI. Both have MLI settings, and when the battery hits 99% SOC, both sense and switch to absorption at almost the same time, and then to float soon thereafter.

(We are dual outboard powered, with alternators cabled to the start battery only.)

[WaldPinkler]

Originally Posted by sailjumanji

Ok, incoming stupid question. You have a 1600-watt generator putting out AC amps to a MassCombi charger putting out DC amps into your lithium battery. Is your MassCombi a 60 amp model (because mine is 100 amp)? And if you add more charger capacity, are you going to be limited by the 1600-watt generator (i.e., not be able to achieve the 100 amps DC into the lithium battery).

I have a 100-amp MassCombi inverter/charger. I think we've seen 90 amps to LiFePo4 battery using the Honda 2200. But you know it tails off a bit as the battery gets full. Ours is a 360 Ah Mastervolt MLI.

I thought 1600W is about 115A at 14V. I thought 100A was reasonable.

Yes, only a 60A model.

I shouldn't see tapering at 100A until the state of charge is 80%+. Stopping there is fine for longer battery life.

Of course your other option is to replace the MassCombi with a 100 amp version. Sell your old working one. And not have to mess with diodes, etc.

These things cost thousands. An extra battery charger may be $100.

[smac999]

a 60a charger on a 1600w gen is pretty maxed out already. no way you are getting 100a charging from 1600w. maybe from a honda 2200


for example the mastervolt 100a battery charger draws 15-18a at 120v. and the honda 2200 is rated for 15a continous


buy some solar panels and leave the gen at home...

[sailjumanji]

Originally Posted by smac999

a 60a charger on a 1600w gen is pretty maxed out already. no way you are getting 100a charging from 1600w. maybe from a honda 2200


for example the mastervolt 100a battery charger draws 15-18a at 120v. and the honda 2200 is rated for 15a continous


buy some solar panels and leave the gen at home...

Thanks. That's what I remembered. Our Honda 2200 going thru a 100 amp Mass Combi maxed out at 90 amps bulk charge on MLI (Mastervolt LiFeP04) battery.