Cheap diy ups advice

[Sinbad]

So I have a 200w cigarette lighter inverter. A load of about 10 watts (no typo). A little 12V battery. A trickle charger.

Desire : run off the battery 24x7 while the charger keeps it charged.

Problem: when battery is fully charged the charger voltage goes to about 15.3. Inverter then shuts off for input overvoltage

Any ideas how to resolve this most welcome...?

Thanks

 

[biometrics]

No man, get proper gear.

 

[Sinbad]

Such as?

 

[Sinbad]

Ah I see a 650 watt ups is pretty cheap... Ok Will return the trickle charger and get one of those

 

[falcon786]

Ah I see a 650 watt ups is pretty cheap... Ok Will return the trickle charger and get one of those

where and how much?

 

[Sinbad]

600 at pc international

 

[Sinbad]

So I got the ups. A little disappointed. The inverter itself pulls 50w,just over 4 amps. On a 7 amp hour battery. So only an hour or so on zero load.
I wonder if the charger inside it can handle a pair of 7ah batteries in parallel

 

[falcon786]

So I got the ups. A little disappointed. The inverter itself pulls 50w,just over 4 amps. On a 7 amp hour battery. So only an hour or so on zero load.
I wonder if the charger inside it can handle a pair of 7ah batteries in parallel

Crap,I'm also looking for a UPS that can run a 50w appliance but for a longer stretch up to 3-4 hours at least.

 

[the354]

Do not add batteries, the internal charger will burn out when all the batteries are flat.

 

[Sinbad]

Do not add batteries, the internal charger will burn out when all the batteries are flat.

Ja that's what i thought.

Dammit. Ah well every hour helps I guess.

 

[falcon786]

Ja that's what i thought.

Dammit. Ah well every hour helps I guess.

What about the bigger ones from PC International,surely the inverter in those will still use 50w but due to higher capacity the entire thing will last much longer?

I'm thinking the 1,5KVA or 2KVA ones.

 

[Sinbad]

What about the bigger ones from PC International,surely the inverter in those will still use 50w but due to higher capacity the entire thing will last much longer?

I'm thinking the 1,5KVA or 2KVA ones.

I have a 2kva as well. It has 2 7ah batteries. But it also has fans, which the small one doesn't have. Much of a muchness I think

 

[falcon786]

I have a 2kva as well. It has 2 7ah batteries. But it also has fans, which the small one doesn't have. Much of a muchness I think

Eish that doesn't sound good,looks like I'll have to take the expensive option,inverter with deep cycle battery.