zsuzsiestekergo
New member
Dear All,
I would like to have advice on my possible dual battery set up for my expedition HZJ 75. I will not prepare the system myself but I would like to understand it well for possible future troubleshooting and to be able to choose what would be best for me. Currently I have no experience on car electrics.
My constraints are the followings:
- For simplicity, I would like to have a dual battery system entirely under bonnet where I have around 70 cm of space for batteries.
- Sufficient power to start 1HZ engine by the second battery, even if starting battery fails is a must, I would not want to get stranded.
- I would like to run a ~30l fridge, extra lightning, a waterpump, laptops, etc. Overall, my possible daily consumption will be somewhere between 40Ah and 65Ah.
- Reliability is important so both batteries should be shock resistant.
- Use will be continuous so many cycles.
- Replacement of one battery without significant problem should be possible, so generic solutions preferred (in any case being in Hungary I have no access to many specific brands)
I have an OEM alternator and planning to complement the system with a ~130watt Solar Cell fixed to top.
I was thinking in buying either
- 2 92 Ah capacity AGM starting batteries (such as Banner Running Bull)
- 2 75 Ah capacity Optima Yellowtops, or
- 1 92 Ah capacity AGM starting battery and a dual purpose battery (such as Varta Professional dual purpose, but this may not be available)
I will connect these batteries with a CTEK D250S gadget which has a nice schematics for how the system would function.
What I do not fully understand yet is how the consumers should be connected. I guess there are two circuits one with the existing consumers on the starter battery, the other is all new consumers on the working battery and the two are connected via the CTEK. However, it would be best to allow giving access to the starter battery's capacity to improve the lifespan of the working battery. At the same time it would be important that neither battery's voltage drops below what is necessary for starting.
Finally, I cannot figure out how the CTEK is affecting the charging of the starter battery, i.e. whether the alternator will manage to charge it the way required for AGMs.
Thanks for any comments and suggestions.
Csaba
I would like to have advice on my possible dual battery set up for my expedition HZJ 75. I will not prepare the system myself but I would like to understand it well for possible future troubleshooting and to be able to choose what would be best for me. Currently I have no experience on car electrics.
My constraints are the followings:
- For simplicity, I would like to have a dual battery system entirely under bonnet where I have around 70 cm of space for batteries.
- Sufficient power to start 1HZ engine by the second battery, even if starting battery fails is a must, I would not want to get stranded.
- I would like to run a ~30l fridge, extra lightning, a waterpump, laptops, etc. Overall, my possible daily consumption will be somewhere between 40Ah and 65Ah.
- Reliability is important so both batteries should be shock resistant.
- Use will be continuous so many cycles.
- Replacement of one battery without significant problem should be possible, so generic solutions preferred (in any case being in Hungary I have no access to many specific brands)
I have an OEM alternator and planning to complement the system with a ~130watt Solar Cell fixed to top.
I was thinking in buying either
- 2 92 Ah capacity AGM starting batteries (such as Banner Running Bull)
- 2 75 Ah capacity Optima Yellowtops, or
- 1 92 Ah capacity AGM starting battery and a dual purpose battery (such as Varta Professional dual purpose, but this may not be available)
I will connect these batteries with a CTEK D250S gadget which has a nice schematics for how the system would function.
What I do not fully understand yet is how the consumers should be connected. I guess there are two circuits one with the existing consumers on the starter battery, the other is all new consumers on the working battery and the two are connected via the CTEK. However, it would be best to allow giving access to the starter battery's capacity to improve the lifespan of the working battery. At the same time it would be important that neither battery's voltage drops below what is necessary for starting.
Finally, I cannot figure out how the CTEK is affecting the charging of the starter battery, i.e. whether the alternator will manage to charge it the way required for AGMs.
Thanks for any comments and suggestions.
Csaba