back up power for tunze stream -- batteries in series??

[CTaylor]

Hi,
Can this be done?:
Using https://www.amazon.com/12v-10Ah-SLA-Rechargeable-Battery/dp/B004WENYYE
2 of them in series in order to get longer pumping time?
If so, I'm thinking I wire negative to negative. Positive to positive. then take a positive to Tunze safety connector (?) https://premiumaquatics.com/products/tunze-safety-connector.html
Then that to the tunze stream?

Let me know if that's right please!... I'm thinking I'd get nearly 24 hrs of pumping with the pump pulsing from 0-50% power (?). which is 4watts (near 0 power) to 25 watt (50 % ) power, average about 15 watt. I might have both hooked up to it so that may bring it to average 30 watts.

TY

 

[RobbyG]

Negative to negative and positive to positive is not a serial connection, they are in parallel and will produce 12v at 20Ah. If this is a 12v pump then at 30w you would get about 8 hours of runtime. Also charging parallel batterie can be tricky so you would need a charger that can independently monitor each battery during charging. I would instead go with a single deep cycle battery with a much higher amperage. More run time and easier to charge.

 

[blowmecius]

A single group 27 battery should have 90 to 100 ah. A flooded battery will cost about $100 at any autoparts store or walmart. If you insist on agm expect to pay 2 to 3 times that.

They are big. They are heavy. But you can put one and a charger pretty far away, say in the garage or basement and just run a wire to your tank. 18 gage wire would be good for 5 amps 25 feet. I believe the tunze adapter has a 4a fuse.

 

[laverda]

A single group 27 battery should have 90 to 100 ah. A flooded battery will cost about $100 at any autoparts store or walmart. If you insist on agm expect to pay 2 to 3 times that.

They are big. They are heavy. But you can put one and a charger pretty far away, say in the garage or basement and just run a wire to your tank. 18 gage wire would be good for 5 amps 25 feet. I believe the tunze adapter has a 4a fuse.

True but that type of battery should not be charged in the house. For many people, myself included it is not practical to have it in the garage.

 

[CTaylor]

TY for all the responses. I do not have a garage. I maybe able to find a spot on my balcony to put it on. I really didnt want to get a huge battery, though, then to wire it from outisde through to the tank. I didnt want to have electrical wires etc going from outside to inside. I just have a problem with that. I might just stick with the original battery back up with a single, not in series, and accept it will be only 6-9 hrs max power. Hopefully I'll be home if power goes out longer so I can switch to my gas generator.