question

Yens Buyse avatar image
Yens Buyse asked

Phoenix combi 12/1600/75 with 200Ah battery

Hey everyone,

I recently acquired a Phoenix Combi (for a good deal) 12V / 1600W / 75A inverter and charger for my boat . After going through the user manual, I noticed that the manufacturer recommends using a 300-600Ah battery with this unit. However, I believe that a 300Ah battery would be overkill for my intended usage.

I plan to use the inverter for basic power needs on my boat, such as running some lights, charging small electronics, and possibly a small refrigerator. A 200Ah battery seems more suitable for my requirements and would also be a more cost-effective option for me.

My question is, would using a 200Ah battery instead of the recommended 300-600Ah battery cause any issues with the inverter's performance or potential battery damage? (overcharging) I want to ensure that I have a reliable power setup without overspending on an unnecessarily large battery.

screenshot-2023-06-08-at-000527.pngI understand that using a smaller capacity battery may result in shorter runtime, but as long as it can handle my modest power demands, I would be satisfied. I want to make sure I'm not overlooking any potential problems or safety concerns by deviating from the manufacturer's recommendations.

Has anyone had experience using a lower capacity battery with a similar inverter/charger setup? Any advice, insights, or recommendations would be greatly appreciated.

Thank you in advance for your help!

battery
screenshot-2023-06-08-at-000527.png (53.8 KiB)
2 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

"for a good deal" - I hope you got it for free.

That device is 20 years or older.

0 Likes 0 ·
Yens Buyse avatar image Yens Buyse Matthias Lange - DE ♦ commented ·
As a matter in fact it was free :)
0 Likes 0 ·
1 Answer
matt1309 avatar image
matt1309 answered ·

Hi @Yens Buyse

As long as you setup the correct limits I imagine this is fine to do however i dont have personal experience trying it.

The one consideration I would flag is the current draw on the battery may be too much depending on chemistry/battery you buy. Should be easily overcome by limiting the inverter output power (not familiar with phoenix but imagine that's possible). Although 75a is less <0.5C it may be worth checking what peak output of the inverter is an limiting that according to protect battery.


Similarly for charging, check the C rating of the battery however if it can handle those c rates then should be ok. Might just have faster degradation if charging at higher rates.



2 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Yens Buyse avatar image Yens Buyse commented ·
Hi @matt1309,


Thank you for your response, I have checked the manual and it looks like it is not possible to limit the 75A continuous charging current. Due to this we are very limited in the batterie we can possibly use and unfortunately are forced to use a higher capacity battery :/

0 Likes 0 ·
Show more comments

Related Resources

Additional resources still need to be added for this topic