UPS - switching to a Marine Battery

[hermosabeach]

Like many of us, my UPS batteries are shot....

Would it be viable to switch to a deep cycle marine battery?

After 2 years, there is maybe 20% left on the UPS batteries.... good for a power hiccup but not being off for more than a minute


Friends sail boat is going on 9 years with his boat batteries....


I'm looking at $70 for 16 amp hours - every 2 years...

APC UPS Battery Replacement, APCRBC124, for APC UPS Models BX1500M, BR1500G, BR1300G, SMC1000-2U, SMC1000-2UC, BR1500GI, BX1500G, SMC1000-2U, SMC1000-2UC, and Select Others Black

$67.90

Weize 12V 100AH Deep Cycle AGM SLA VRLA Battery for Solar System RV Camping Trolling Motor

[Robotron2k84]

That would probably depend on the maintenance programs that the UPS uses to desulfate and charge the cell. I don’t believe they are completely compatible.

[C.G.]

Yes deeo cycle batteries such as Marine batteries are better, they are designed to be drained to almost nothing and charged back up unlike conventional batteries which get damaged if this is done.

Not exactly. Deep cycle batteries are designed to discharge up to generally 50% for AGM deep cycle and up to 80% for wet cell deep cycle. For long life, it is best to keep it at 12V or higher and damage will start to occur if 10.5 Volts and lower. If below 7 Volts it may be difficult or impossible to bring the battery back to life, especially if one has a "smart" battery charger which would then refuse to charge (in which case you have to coax the battery to app 7 Volts with a trickle charger, which will take a long time, after which the battery charger may try to charge it, but the battery life will short aftewards.

[oktavist]

I hooked my UPS up to some larger external batteries. Now it lasts 8 hours instead of 10 minutes.

Just make sure to match the voltage and battery chemistry.

[Rob454]

The charger for the UPS may not be strong enough to charge that big a battery. I know on some of our systems that use large 100 AH batteries back ups batteires we need to use a high rate charger as the system built in charger just isnt powerful enough to charge such huge battery.
At that point just get a Battery tender and two 6 volt batteires wire them up as 12 volt and use that as the charging system and the batteires as the back up UPS

[C.G.]

The charger for the UPS may not be strong enough to charge that big a battery. I know on some of our systems that use large 100 AH batteries back ups batteires we need to use a high rate charger as the system built in charger just isnt powerful enough to charge such huge battery.
At that point just get a Battery tender and two 6 volt batteires wire them up as 12 volt and use that as the charging system and the batteires as the back up UPS

Even a trickle charger will eventually fully charge a battery whether 80A or 200A but it will take a long time; the reason for higher wattage chargers is that it will take less time to charge the battery. Whether one needs faster charging or not is up to installation requirements.

[Rob454]

Even a trickle charger will eventually fully charge a battery whether 80A or 200A but it will take a long time; the reason for higher wattage chargers is that it will take less time to charge the battery. Whether one needs faster charging or not is up to installation requirements.

Ok well I can’t wait till im 100 years old to use the ups. Just replace the ups batteries.