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How much would additional power cost on a 3U Colocation plan?

It depends of the power supply unit (PSU) of you server.

500W Server Chassis
If your server has a PSU of 500W you have to purchase (reserve) 1 Amp additional power. It will cost you €20/month. Please note that it might or might not be sufficient. If it is sufficient you should not expect any additional charges. Depending on your power consumption however, you might need to pay up to €15 at the end of the month.
800W - 920W Server Chassis
If you server has 800W - 920W PSU you must purchase 3 Amps of additional power at €60/month. They should be enough and you'd not expect any bills over electricity consumption. A server with 920W PSU needs 4 Amps of reserved power. However if you colocate a machine with such PSU we would charge €40/month. You should expect a bill for overage power at the end of the service cycle.
1200W - 1280W Chassis
For 3U server that has a PSU between 1200W and 1280W, you have to purchase/reserve 4 Amps of additional power. They cost €80/month.
Having reserved 5 Amps (1 Amp + 4 Ams add-on), you should be OK and would not have any additional costs for electricity. If your power usages is less than 5 Amps, we will add credit for unused power to your account. You can use the credit to reduce any of your next bills.

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